30/3-6 S
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General information
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Wellbore history
GeneralWell 30/3-6 S was drilled from the fixed installation Veslefrikk A. The Veslefrikk Field is located on the Brage Horst north of the Oseberg Field in the North Sea. The objective of 30/3-6 S was to test the hydrocarbon potential in the I-prospect within the Brent, Dunlin and Statfjord reservoirs. The I-prospect is located on a down-faulted drag structure just southwest of the main Veslefrikk field.Operations and resultsWell 30/3-6 S was spudded from slot number 20 on the fixed installation Veslefrikk A. The drilling phase was from 26 December 1993 to 6 March 1994. The well was drilled in a southwesterly direction from Veslefrikk A, and it has an S-shape wellbore with maximum inclination of 70°. Due to missing well logs for the upper part of the well, lithostratigraphy for this part of the well is not supplied.The well encountered hydrocarbons in the Brent Group down to the middle of the Oseberg Formation, and found a significantly thicker Jurassic sequence than anticipated.Seven cores were cut between 5241 m and 5478.6 m, covering the Tarbert, Ness, and Etive Formations. Core recoveries from 86% to 100% was obtained. The RFT tool was run for pressure points, but no fluid samples were taken.Exploration well 30/3-6 S is classified as a Brent Group oil and gas discovery. As the discovery was economic favourably, the well was completed permanently as oil producer, and on 20 April 1994 it was re-classified to development well 30/3-A-20.TestingTwo tests were performed in the Oseberg Formation.Reservoir Unit B2C was tested in test 1 from 5580 m to 5598 m (3229.2 m to 3244.1 m TVD MSL). It produced 310 Sm3 volatile oil/day with a GOR of 282 Sm3/Sm3.Reservoir Unit B3 was tested in test 2 from 5503 m to 5530 m (3168.6 m to 3189.2 m TVD MSL). It produced 512000 Sm3 gas/day with a GOR of 1160 Sm3/Sm3. -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom15241.05265.5[m ]25294.05313.7[m ]35315.05323.0[m ]45328.05340.8[m ]55341.05356.4[m ]65359.05386.1[m ]75451.05478.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]135.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR20619.024625.00.00SURF.COND.13 3/82036.017 1/22041.00.00INTERM.9 5/83836.012 1/43876.01.70FITINTERM.75139.08 1/25140.01.65OPEN HOLE6085.066085.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL-VDL-GR46456002LDL CNL BHC DITE GR51106085MWD - SLIM EWR P4 DGR51406085MWD DGR GR4736085MWD GR51406068RFT HP GR52235633VSP49756007 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit52145214529954425481550356885688582358976027 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf2.13pdf11.14 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4691.10WATER BASED28.12.19934971.1718.011.0WATER BASED30.12.19934971.1720.09.5WATER BASED30.12.19938191.2117.012.0WATER BASED03.01.199413051.2815.010.5WATER BASED03.01.199416171.2814.011.5WATER BASED03.01.199420411.2814.010.5WATER BASED05.01.199420411.2813.09.5WATER BASED06.01.199420411.2814.09.5WATER BASED07.01.199420411.2814.010.0WATER BASED07.01.199421131.6526.012.0WATER BASED10.01.199428091.6524.013.0WATER BASED10.01.199429301.6626.012.5WATER BASED10.01.199429301.6629.014.0WATER BASED14.01.199429301.6627.010.5WATER BASED14.01.199429301.6624.012.5WATER BASED14.01.199429301.7027.011.5WATER BASED17.01.199429301.7027.010.5WATER BASED17.01.199429301.6625.011.0WATER BASED17.01.199429301.6824.013.0WATER BASED17.01.199429561.7028.010.5WATER BASED19.01.199429561.7026.011.0WATER BASED20.01.199429561.7025.011.5WATER BASED20.01.199429561.7027.011.0WATER BASED21.01.199435241.6629.014.0WATER BASED14.01.199436691.6624.012.5WATER BASED14.01.199437061.6627.010.5WATER BASED14.01.199437061.6625.011.0WATER BASED17.01.199437061.6824.013.0WATER BASED17.01.199437491.7027.011.5WATER BASED17.01.199438361.7028.013.5WATER BASED24.01.199438361.7039.010.0OIL BASED24.01.199438361.6543.09.5OIL BASED24.01.199438541.7027.010.5WATER BASED17.01.199438761.7026.011.0WATER BASED20.01.199438761.7027.011.0WATER BASED21.01.199438761.7025.011.5WATER BASED20.01.199438761.7028.010.5WATER BASED19.01.199442741.6552.010.5OIL BASED25.01.199443031.6558.012.5OIL BASED27.01.199444461.6561.010.0OIL BASED27.01.199447951.6556.07.5OIL BASED28.01.199447951.6553.07.0OIL BASED01.02.199447951.6552.06.5OIL BASED01.02.199447951.6552.07.0OIL BASED01.02.199448501.6556.07.5OIL BASED28.01.199451261.6553.07.0OIL BASED01.02.199451401.6552.07.0OIL BASED01.02.199451401.2538.08.0OIL BASED07.02.199451401.6552.06.5OIL BASED01.02.199451401.5534.05.5OIL BASED03.02.199451401.5546.05.5OIL BASED03.02.199451401.2528.07.0OIL BASED07.02.199451401.2542.08.0OIL BASED09.02.199451401.2538.06.0OIL BASED09.02.199451401.2537.06.5OIL BASED11.02.199451401.2532.05.5OIL BASED15.02.199451401.2531.05.5OIL BASED15.02.199451401.2532.05.5OIL BASED16.02.199451401.2533.05.0OIL BASED17.02.199451401.2538.05.5OIL BASED17.02.199451401.2535.05.5OIL BASED22.02.199451401.2539.06.0OIL BASED22.02.199451401.2537.07.0OIL BASED22.02.199451401.2542.07.0OIL BASED23.02.199451401.2540.07.0OIL BASED23.02.199451401.2536.05.5OIL BASED24.02.199451401.2538.06.0OIL BASED25.02.199451401.2536.05.5OIL BASED28.02.199451401.5537.05.5OIL BASED03.02.199451401.2537.06.0OIL BASED04.02.199451401.2537.08.0OIL BASED07.02.199451401.2536.06.5OIL BASED11.02.199451401.2540.06.5OIL BASED15.02.199451401.2539.06.5OIL BASED22.02.199451401.2541.07.5OIL BASED28.02.199451401.2542.08.0OIL BASED01.03.199451401.2541.06.0OIL BASED02.03.199451401.2535.05.0OIL BASED04.03.199451941.2542.08.0OIL BASED09.02.199452411.2537.08.0OIL BASED07.02.199452671.2538.08.0OIL BASED07.02.199453151.2538.06.0OIL BASED09.02.199453281.2536.06.5OIL BASED11.02.199453591.2537.06.5OIL BASED11.02.199453861.2540.06.5OIL BASED15.02.199454101.2532.05.5OIL BASED15.02.199454511.2531.05.5OIL BASED15.02.199455141.2532.05.5OIL BASED16.02.199455851.2533.05.0OIL BASED17.02.199456431.2538.05.5OIL BASED17.02.199457321.2535.05.5OIL BASED22.02.199458371.2539.06.0OIL BASED22.02.199459321.2539.06.5OIL BASED22.02.199460611.2537.07.0OIL BASED22.02.199460851.2542.07.0OIL BASED23.02.199460851.2536.05.5OIL BASED28.02.199460851.2538.06.0OIL BASED25.02.199460851.2536.05.5OIL BASED24.02.199460851.2540.07.0OIL BASED23.02.199460851.2535.05.0OIL BASED04.03.199460851.2533.05.5OIL BASED04.03.199460851.2533.05.5OIL BASED04.03.199460851.10DUMMY08.03.199460851.10DUMMY11.03.199460851.10DUMMY15.03.199460851.10DUMMY15.03.199460851.10DUMMY15.03.199460851.10DUMMY15.03.199460851.10DUMMY17.03.199460851.2541.06.0OIL BASED02.03.199460851.2541.07.5OIL BASED28.02.199460851.2542.08.0OIL BASED01.03.199460851.10DUMMY11.03.199460851.10DUMMY16.03.1994